Broadband Dual-Polarized Dielectric Patch Antenna With High Isolation for Full-Duplex Communication
Xiaoke Zhang, Yan‐Hui Ke, Xueying Wang, Shi‐Chang Tang, Jian‐Xin Chen
Abstract
A broadband dual-polarized dielectric patch (DP) antenna is investigated for the in-band full-duplex applications. Taking full advantage of the multimode feature of DP, four resonant modes are excited and adjusted to form the two wide operating bands with orthogonal polarization. Among them, the dominant TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">10</sub> mode and the high-order TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">12</sub> mode provide the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</i> -polarization while the TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> mode and the antiphase TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">02</sub> mode provide the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">y</i> -polarization. In addition, the differential-fed scheme is applied to excite the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">y</i> -polarization modes for high isolation. Thanks to the features of low loss and low profile of DP, the proposed antenna obtains advantages in terms of radiation efficiency and profile height. An antenna prototype is fabricated and measured. The experimental results illustrate that the measured isolation during the whole band is better than 48 dB with a low profile of 0.05 <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">min</sub> . The −10 dB bandwidths of two polarizations are 29.5% (4.71–6.1 GHz) and 18.9% (4.81–5.72 GHz), respectively.